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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2010 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.collect;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import com.google.common.annotations.Beta;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import com.google.common.annotations.GwtCompatible;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.io.Serializable;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.math.BigInteger;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>/**<a name="line.25"></a>
<span class="sourceLineNo">026</span> * Factories for common {@link DiscreteDomain} instances.<a name="line.26"></a>
<span class="sourceLineNo">027</span> * <a name="line.27"></a>
<span class="sourceLineNo">028</span> * &lt;p&gt;See the Guava User Guide section on &lt;a href=<a name="line.28"></a>
<span class="sourceLineNo">029</span> * "http://code.google.com/p/guava-libraries/wiki/RangesExplained#Discrete_Domains"&gt;<a name="line.29"></a>
<span class="sourceLineNo">030</span> * {@code DiscreteDomain}&lt;/a&gt;.<a name="line.30"></a>
<span class="sourceLineNo">031</span> *<a name="line.31"></a>
<span class="sourceLineNo">032</span> * @author Gregory Kick<a name="line.32"></a>
<span class="sourceLineNo">033</span> * @since 10.0<a name="line.33"></a>
<span class="sourceLineNo">034</span> */<a name="line.34"></a>
<span class="sourceLineNo">035</span>@GwtCompatible<a name="line.35"></a>
<span class="sourceLineNo">036</span>@Beta<a name="line.36"></a>
<span class="sourceLineNo">037</span>public final class DiscreteDomains {<a name="line.37"></a>
<span class="sourceLineNo">038</span>  private DiscreteDomains() {}<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>  /**<a name="line.40"></a>
<span class="sourceLineNo">041</span>   * Returns the discrete domain for values of type {@code Integer}.<a name="line.41"></a>
<span class="sourceLineNo">042</span>   */<a name="line.42"></a>
<span class="sourceLineNo">043</span>  public static DiscreteDomain&lt;Integer&gt; integers() {<a name="line.43"></a>
<span class="sourceLineNo">044</span>    return IntegerDomain.INSTANCE;<a name="line.44"></a>
<span class="sourceLineNo">045</span>  }<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span>  private static final class IntegerDomain extends DiscreteDomain&lt;Integer&gt;<a name="line.47"></a>
<span class="sourceLineNo">048</span>      implements Serializable {<a name="line.48"></a>
<span class="sourceLineNo">049</span>    private static final IntegerDomain INSTANCE = new IntegerDomain();<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span>    @Override public Integer next(Integer value) {<a name="line.51"></a>
<span class="sourceLineNo">052</span>      int i = value;<a name="line.52"></a>
<span class="sourceLineNo">053</span>      return (i == Integer.MAX_VALUE) ? null : i + 1;<a name="line.53"></a>
<span class="sourceLineNo">054</span>    }<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>    @Override public Integer previous(Integer value) {<a name="line.56"></a>
<span class="sourceLineNo">057</span>      int i = value;<a name="line.57"></a>
<span class="sourceLineNo">058</span>      return (i == Integer.MIN_VALUE) ? null : i - 1;<a name="line.58"></a>
<span class="sourceLineNo">059</span>    }<a name="line.59"></a>
<span class="sourceLineNo">060</span><a name="line.60"></a>
<span class="sourceLineNo">061</span>    @Override public long distance(Integer start, Integer end) {<a name="line.61"></a>
<span class="sourceLineNo">062</span>      return (long) end - start;<a name="line.62"></a>
<span class="sourceLineNo">063</span>    }<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span>    @Override public Integer minValue() {<a name="line.65"></a>
<span class="sourceLineNo">066</span>      return Integer.MIN_VALUE;<a name="line.66"></a>
<span class="sourceLineNo">067</span>    }<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span>    @Override public Integer maxValue() {<a name="line.69"></a>
<span class="sourceLineNo">070</span>      return Integer.MAX_VALUE;<a name="line.70"></a>
<span class="sourceLineNo">071</span>    }<a name="line.71"></a>
<span class="sourceLineNo">072</span><a name="line.72"></a>
<span class="sourceLineNo">073</span>    private Object readResolve() {<a name="line.73"></a>
<span class="sourceLineNo">074</span>      return INSTANCE;<a name="line.74"></a>
<span class="sourceLineNo">075</span>    }<a name="line.75"></a>
<span class="sourceLineNo">076</span>    <a name="line.76"></a>
<span class="sourceLineNo">077</span>    @Override<a name="line.77"></a>
<span class="sourceLineNo">078</span>    public String toString() {<a name="line.78"></a>
<span class="sourceLineNo">079</span>      return "DiscreteDomains.integers()";<a name="line.79"></a>
<span class="sourceLineNo">080</span>    }<a name="line.80"></a>
<span class="sourceLineNo">081</span><a name="line.81"></a>
<span class="sourceLineNo">082</span>    private static final long serialVersionUID = 0;<a name="line.82"></a>
<span class="sourceLineNo">083</span>  }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span>  /**<a name="line.85"></a>
<span class="sourceLineNo">086</span>   * Returns the discrete domain for values of type {@code Long}.<a name="line.86"></a>
<span class="sourceLineNo">087</span>   */<a name="line.87"></a>
<span class="sourceLineNo">088</span>  public static DiscreteDomain&lt;Long&gt; longs() {<a name="line.88"></a>
<span class="sourceLineNo">089</span>    return LongDomain.INSTANCE;<a name="line.89"></a>
<span class="sourceLineNo">090</span>  }<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span>  private static final class LongDomain extends DiscreteDomain&lt;Long&gt;<a name="line.92"></a>
<span class="sourceLineNo">093</span>      implements Serializable {<a name="line.93"></a>
<span class="sourceLineNo">094</span>    private static final LongDomain INSTANCE = new LongDomain();<a name="line.94"></a>
<span class="sourceLineNo">095</span><a name="line.95"></a>
<span class="sourceLineNo">096</span>    @Override public Long next(Long value) {<a name="line.96"></a>
<span class="sourceLineNo">097</span>      long l = value;<a name="line.97"></a>
<span class="sourceLineNo">098</span>      return (l == Long.MAX_VALUE) ? null : l + 1;<a name="line.98"></a>
<span class="sourceLineNo">099</span>    }<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span>    @Override public Long previous(Long value) {<a name="line.101"></a>
<span class="sourceLineNo">102</span>      long l = value;<a name="line.102"></a>
<span class="sourceLineNo">103</span>      return (l == Long.MIN_VALUE) ? null : l - 1;<a name="line.103"></a>
<span class="sourceLineNo">104</span>    }<a name="line.104"></a>
<span class="sourceLineNo">105</span><a name="line.105"></a>
<span class="sourceLineNo">106</span>    @Override public long distance(Long start, Long end) {<a name="line.106"></a>
<span class="sourceLineNo">107</span>      long result = end - start;<a name="line.107"></a>
<span class="sourceLineNo">108</span>      if (end &gt; start &amp;&amp; result &lt; 0) { // overflow<a name="line.108"></a>
<span class="sourceLineNo">109</span>        return Long.MAX_VALUE;<a name="line.109"></a>
<span class="sourceLineNo">110</span>      }<a name="line.110"></a>
<span class="sourceLineNo">111</span>      if (end &lt; start &amp;&amp; result &gt; 0) { // underflow<a name="line.111"></a>
<span class="sourceLineNo">112</span>        return Long.MIN_VALUE;<a name="line.112"></a>
<span class="sourceLineNo">113</span>      }<a name="line.113"></a>
<span class="sourceLineNo">114</span>      return result;<a name="line.114"></a>
<span class="sourceLineNo">115</span>    }<a name="line.115"></a>
<span class="sourceLineNo">116</span><a name="line.116"></a>
<span class="sourceLineNo">117</span>    @Override public Long minValue() {<a name="line.117"></a>
<span class="sourceLineNo">118</span>      return Long.MIN_VALUE;<a name="line.118"></a>
<span class="sourceLineNo">119</span>    }<a name="line.119"></a>
<span class="sourceLineNo">120</span><a name="line.120"></a>
<span class="sourceLineNo">121</span>    @Override public Long maxValue() {<a name="line.121"></a>
<span class="sourceLineNo">122</span>      return Long.MAX_VALUE;<a name="line.122"></a>
<span class="sourceLineNo">123</span>    }<a name="line.123"></a>
<span class="sourceLineNo">124</span><a name="line.124"></a>
<span class="sourceLineNo">125</span>    private Object readResolve() {<a name="line.125"></a>
<span class="sourceLineNo">126</span>      return INSTANCE;<a name="line.126"></a>
<span class="sourceLineNo">127</span>    }<a name="line.127"></a>
<span class="sourceLineNo">128</span>    <a name="line.128"></a>
<span class="sourceLineNo">129</span>    @Override<a name="line.129"></a>
<span class="sourceLineNo">130</span>    public String toString() {<a name="line.130"></a>
<span class="sourceLineNo">131</span>      return "DiscreteDomains.longs()";<a name="line.131"></a>
<span class="sourceLineNo">132</span>    }<a name="line.132"></a>
<span class="sourceLineNo">133</span><a name="line.133"></a>
<span class="sourceLineNo">134</span>    private static final long serialVersionUID = 0;<a name="line.134"></a>
<span class="sourceLineNo">135</span>  }<a name="line.135"></a>
<span class="sourceLineNo">136</span><a name="line.136"></a>
<span class="sourceLineNo">137</span>  /**<a name="line.137"></a>
<span class="sourceLineNo">138</span>   * Returns the discrete domain for values of type {@code BigInteger}.<a name="line.138"></a>
<span class="sourceLineNo">139</span>   */<a name="line.139"></a>
<span class="sourceLineNo">140</span>  // TODO(kevinb): make sure it's tested, and make it public<a name="line.140"></a>
<span class="sourceLineNo">141</span>  static DiscreteDomain&lt;BigInteger&gt; bigIntegers() {<a name="line.141"></a>
<span class="sourceLineNo">142</span>    return BigIntegerDomain.INSTANCE;<a name="line.142"></a>
<span class="sourceLineNo">143</span>  }<a name="line.143"></a>
<span class="sourceLineNo">144</span><a name="line.144"></a>
<span class="sourceLineNo">145</span>  private static final class BigIntegerDomain extends DiscreteDomain&lt;BigInteger&gt;<a name="line.145"></a>
<span class="sourceLineNo">146</span>      implements Serializable {<a name="line.146"></a>
<span class="sourceLineNo">147</span>    private static final BigIntegerDomain INSTANCE = new BigIntegerDomain();<a name="line.147"></a>
<span class="sourceLineNo">148</span><a name="line.148"></a>
<span class="sourceLineNo">149</span>    private static final BigInteger MIN_LONG =<a name="line.149"></a>
<span class="sourceLineNo">150</span>        BigInteger.valueOf(Long.MIN_VALUE);<a name="line.150"></a>
<span class="sourceLineNo">151</span>    private static final BigInteger MAX_LONG =<a name="line.151"></a>
<span class="sourceLineNo">152</span>        BigInteger.valueOf(Long.MAX_VALUE);<a name="line.152"></a>
<span class="sourceLineNo">153</span><a name="line.153"></a>
<span class="sourceLineNo">154</span>    @Override public BigInteger next(BigInteger value) {<a name="line.154"></a>
<span class="sourceLineNo">155</span>      return value.add(BigInteger.ONE);<a name="line.155"></a>
<span class="sourceLineNo">156</span>    }<a name="line.156"></a>
<span class="sourceLineNo">157</span><a name="line.157"></a>
<span class="sourceLineNo">158</span>    @Override public BigInteger previous(BigInteger value) {<a name="line.158"></a>
<span class="sourceLineNo">159</span>      return value.subtract(BigInteger.ONE);<a name="line.159"></a>
<span class="sourceLineNo">160</span>    }<a name="line.160"></a>
<span class="sourceLineNo">161</span><a name="line.161"></a>
<span class="sourceLineNo">162</span>    @Override public long distance(BigInteger start, BigInteger end) {<a name="line.162"></a>
<span class="sourceLineNo">163</span>      return start.subtract(end).max(MIN_LONG).min(MAX_LONG).longValue();<a name="line.163"></a>
<span class="sourceLineNo">164</span>    }<a name="line.164"></a>
<span class="sourceLineNo">165</span><a name="line.165"></a>
<span class="sourceLineNo">166</span>    private Object readResolve() {<a name="line.166"></a>
<span class="sourceLineNo">167</span>      return INSTANCE;<a name="line.167"></a>
<span class="sourceLineNo">168</span>    }<a name="line.168"></a>
<span class="sourceLineNo">169</span>    <a name="line.169"></a>
<span class="sourceLineNo">170</span>    @Override<a name="line.170"></a>
<span class="sourceLineNo">171</span>    public String toString() {<a name="line.171"></a>
<span class="sourceLineNo">172</span>      return "DiscreteDomains.bigIntegers()";<a name="line.172"></a>
<span class="sourceLineNo">173</span>    }<a name="line.173"></a>
<span class="sourceLineNo">174</span><a name="line.174"></a>
<span class="sourceLineNo">175</span>    private static final long serialVersionUID = 0;<a name="line.175"></a>
<span class="sourceLineNo">176</span>  }<a name="line.176"></a>
<span class="sourceLineNo">177</span>}<a name="line.177"></a>




























































</pre>
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